Recording function is simple: Press and hold the record button, align the recording hole with the sound, and release the button to play the recording when you are done. Multiple Voice Recordings: Recording time is 30 seconds, you can record more than one voice, and the previous voice will be automatically erased when the recording is full. Accurate and Wide Range of Detection Angles: With a 120-degree PIR wide-angle sensor, this sound player detects motion from up to 13 feet (4 meters) day or night and plays a recording that is loud and clear. Great Sound Quality: Adjustable sound level, 8 ohm speaker, clear sound. Fully featured yet lightweight and small (only 5cm x 7cm). Endless Applications (for indoor use): Perfect for the elderly or those with memory loss who need reminders, in-store advertising, exhibitions, trade shows, doorman/greeter, keeping instructions for others while you are away, or blocking embarrassing bathroom sounds. 3x AAA 1.5V batteries required (not included), or power supply with USB power adapter (DC5V) (not included)